Synthesis, characterization and application of a fluorescence doped Alumina powder prepared by wet-chemical synthesis

Reference	Presenter	Authors (Institution)	Abstract
06-102	Mauricio Antonio Custodio de Melo	Melo, M.A.(Universidade Estadual de Maringa); Souza, N.E.(Instituto Federal do Paraná); Santos, I.A.(Maringa State University); Capeloto, O.A.(Universidade Estadual de Maringá); Astrath, N.G.(Universidade Estadual de Maringá); Hechenleitner, A.A.(Universidade Estadual de Maringá); Pineda, E.A.(Universidade Estadual de Maringá);	Ceramics, which exhibit luminescence, play an important role in new technologies. Luminescence are mainly used in lighting, displays, solar cells, scintillator, and sensors. Recently was presented the idea of utilizing the phenomenon of luminescence (photoluminescence) to reduce the temperature of objects in sunlight, using ruby crystals. There are a number of applications where it is desirable to reject solar heat. These include decreasing of solar heating in the buildings and cars leads to a decrease in the use of energy in air conditioners. Also, reducing solar heating in materials which can be damaged by excessive heat. In this work, Ruby (Cr3+:Al2O3) powder with different chromium concentration have been prepared through a reasonably uncomplicated sol–gel method with water as a solvent. The synthesis process was monitored by the techniques of thermogravimetry (TG), X-ray powder diffractometry (XRD) and scanning electron microscopy (SEM). These techniques were used to characterize the structural and the chemical features of ?-Al2O3. The powders doped with chromium were analyzed by photoacoustic spectroscopy (PAS) and fluorescence Spectroscopy. The fluorescence of Cr3+ was detected, and as expected, depends on the concentration of chromium. These preliminary results show that this material has high potential for technological use, for example in sunscreen paints. The co-doped with other metals has also been discussed.
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